terça-feira, 17 de novembro de 2009

Fósseis do Cretácico



AMMONITES: 1. Hoplites; Ammonoideos: 2. Crioceras (C. Inf., Cord. béticas y Baleares); 3. Turrilites (C. Inf., C. Cant.);
M. GASTEROPODOS: 4. Lychnus (terrestre);
M. BIVALVOS: 5. y 6. Exogyra (cosmopolita); Rudistas: 7. Toucasia (C. Inf.); 8. Hippurites (C. Sup.); 9. Radiolites (C. Sup.);
EQUINIDOS: Regulares: 10. Cidaris (Jur.-actual.); 11. Pygaster; Irregulares: 12. Micraster (C. Sup., cosmopoli­ta).
BELEMNITES: 13. Rostro tipo Cretácico (escotadura región alveolar).



Cretácico


Na escala de tempo geológico, o Cretácico ou Cretácico é o período da era Mesozóica do éon Fanerozóico que está compreendido entre 145 milhões e 500 mil e 65 milhões e 500 mil anos atrás, aproximadamente. O período Cretácico sucede o período Jurássico de sua era e precede o período Paleogénico da era Cenozóica de seu éon. Divide-se nas épocas Cretácico Inferior e Cretácico Superior, da mais antiga para a mais recente. O Cretácico Inferior está compreendido entre 145,5 milhões e 99,6 milhões anos atrás, aproximadamente.



Mesozoico
145,5 ±4,0
Jurássico
199,6 ±0,6
Triássico
251,0 ±0,4
J.C. e N.M.

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